Guru
Joined: 22/02/2006
Location: AustraliaPosts: 2137
| Posted: 07:31am 03 Jun 2026 |
Well I got my head around the charging circuit I think
Now the lower 5.08mm connector is the PV input where it feeds into the collector of the BC337 transistor then 1K series and 22K to ground and GP28 is used to enable charging. Now when we want to measure battery voltage GP28 switch's off the BC337 so the voltage divider can measure the battery where GP26 is used.
Off memory that lithium battery the the local battery guy made for had a 12 volt max input so by clamping the solar panel to 12 volts won't burn out the BMS.
Regards Bryan